Acid-proof drum and method of making same



July 6,1926. l 1,591,373

v R. T. caRlFFlTHs ACIDPROOF DRUM AND METHOD 0F MAKING SAME Filed Nov. 27', 1925 \\\\\\V\\\\\\ n' i, f// .HHHIMM c, y N "lllllllllllij y Z r z l `:Lf

15. l I; 1gli Patented y UNITED STATES PATENT oFElcE.

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Application med November 27, 1925-.. serial no. 71,626.

My present invention relates to improvements in portable cylindrical acid-proof shipping drums designed for shipping acids.

The rules of the Interstate Commerce I Commission forbid'the shipping of such material in drums having removable heads, and diiiculty has been experienced in producing a satisfactory-drum of the fixed head type.

The present invention aims to provide a.

drum having a non-removable head, and a method of making the same vwhereby a strong, durable article will be produced, and one in which all danger of separation or displacement of the liningwill be.prevented,

16 and which drum may be expeditiously yand economically produced.. .Y

^ In order that-my invention may be better understood, reference is made to the accompanying drawings, in which A 20 Fi re 1 isl a central vertical section through the drum showing the body and ends in loosely assembled position.

Fig. 2 is a sectional detail showing a por- .tion of the drum only, and `cooperating .pressing and swaging rollers to illustrate the -action of clamping-the layers be.- rjween a head and corresponding end of the Fig. 3 is a sectional detail view of a por- 3o tion of a container illustrating a modified form with the parts inV a position corresponding to that of Fig. 1.

Fig. 4 is aview of the parts shown in Fig. '3, as they wouldA appear after the swaging or expanding action.. Fig;- 5 is a view illustrating the head ofa'- contalner such as shown in Fig. 1. 40 ig.- 6 lis a view showing how, as an alternative, the clamping action may be accomlished b swagmg an inwardly extending ad in t econtainer wall. l

Y In p according -to my invention. I provide a, substantially lindrical metallic. container body 1 and a ead 2 of similar material, having a. cylindric portion 2" adapted to be within the end of the. container body. Each of these provided 5 .with a lining of nen-.metallic wid-proof lm A.Tte'riahpreferably4 of rubber, secured to the corresponding container wall in any suitable or desired manner. These linings are preferably made of rubber and may have uncured surfaces. v v

` The lining layer 2* of the headextended up over the cylindric head portions 2L so that when a head is inserted within an end of the container body, the portion of the lining covering the cylindric part of the head, and the lining 1-" of the body overlap each other. The external 'diameter of the cylindrical portion 2a is made suiliciently less than the internal diameter of the drum end to provide a space between the opposed metallic walls which is more than the combined thickness of the two overlying layers, so that when ahead is inserted in or assembled with the body, as shown'in Fig. 1, an annular space 3 is provided between the juxtaposed faces of the head and body linings. This enables the -cylindric portion of the head to beinserted 1n the bod end without danger of damaging or disp cing the coacting lining portions.

. the juxtaposed meta walls. This swaging raction may be readily accomplished by means such as shown conveniently in Fig. 2,

. comprising-a relativelyl sharply convex faced a modifiedv manner of expanding the cylindri'c wall ofA outer surface o f the lcontainer wall in opposition tothe roller 4. By thi's means a bead 2 is swaged outwardly in the cylindric portion of the head, which binds or clamps the .overlapping orv juxtaposed portions of the linings rmly together to produce an acidtight joint and .a firmconnection of'thevlinings atv this point, which absolutely precludes any sa away of the from the contalner wa i 10 Any suitable means may be' provided for permanently securing the metalheads to the container bodies, buta convenient, economical land durable method of 'accomplishing this is to provide the body with outwardly turned end flanges l, andthe heads withy corresponding marginal flanges 2'? which are rolled together `or interlocked to form a crimped joint, as indicated at 'd in Fig. 2. In practice the seam d is preferably formed prior to the action of the rolls L1-.-5.

The rolling action of Fig. 2 is simple, economical and eicacious, and acts progressively, but the same can be accomplished by expander means, as shown in Fig. 5. In this- I provide an annularseries of expander segments 6 having bead forming ribs 6, the segments being mounted for radial movement on a support 7 and provided with tapered inner walls designed to coact with a cone-shaped `expander member 8 which may be operated by 'a rod 8B by any suitable means. Y f' f A further modification ofgcontainer head is shown in Fig. 3, in which the head 2x is provided with a shoulder w, Vthe reduced.

portion for the marginal edge of the head lining being below this shoulder. In this form-the cylindric portion of the head above the shoulder absolutely insures the head being inserted without the head lining commgm contact with the wall lining. After thehead has been inserted, as shown in Fig.

'3, the shoulder may be rolled down and so and thrust sustaining rollers 4a and 5a.

While I have referred herein to the con'-l ktainer as a cylindric one, it will be understood that it need no t be absolutely circular, vnor need it be directly cylindrical throughout between the endsvthe only thing being necessary isfthat the walls ofthe end portions of the drum and thecorresponding walls of the heads shall be Aaccurately spaced apart at all points, and be so spaced as 'to support the margins: of the head linings in the position to be out of contact with the body linings during assembly.

Having thus describedmy invention what I claim 1s:-

1. An acid-proof metal drum comprising a body wall having an open end and a lining of rubber composition, and a head having a cylindrical wall portion .projecting within the end of the body wall, said head having a lining of rubber composition extending over the cylindric wall portion, onen of said juxta- 6 0k posed wall Vportions being deformed and compressing the juxtaposed lining portions between its deformed portion and the corresponding ortion of the other wall.

2. An aci -proof metal drum comprising A an open ended body having a lining of rubber composition, andl heads having cylindrii cal portions projecting within the ends of the body, saidheads having linings of rubber composition acid-proof material extending over the cylindric portions, the juxtaposed portions of the body and head linings lying between the opposed walls .of the body and heads, said heads having projecting marginal 4'portions which are interlocked .75 with the respective ends of the bod and one of said opposed walls being de ormedy towards the other wall thereby holding the juxtaposed lin-ing portions pressed into substantially homogeneous union.

c 3. An acid-proof metal drum comprising an open ended tubular body having a lining of sheet rubber composition, and heads having cylindric port-ions projecting within, the ends of the body whereby the heads and 85 bodies provide overlapping parts, said heads having linings of sheet rubber composition which vextend over the cylindric portions, one of said overlapping parts having an annular-rounded bead projecting towards the'90 othertpart and compressing the overlapping sheet portions together on a line intermediate the height of the cylindric portion of the head. j

In testimony whereof, I ai'lix my signa 95 ture.

RICHARD T. GRIFFITHS.. j 

